<p>
  In this chapter we have introduced functions and classes. When we write a QuantConnect algorithm, we would define our algorithm as a class (QCAlgorithm). This means our algorithm inherited the QC API methods from QCAlgorithm class.
</p>

<p>
  In the next chapter, we will introduce NumPy and Pandas, which enable us to conduct scientific calculations in Python.
</p>
